Which section of 14 CFR outlines the fabrication of aircraft replacement and modification parts (PMA)?

The section of 14 CFR that outlines the fabrication of aircraft replacement and modification parts, specifically referring to Parts Manufacturer Approval (PMA), is indeed 14 CFR §21.303. This regulation provides guidance on how individuals or companies can gain approval to manufacture replacement parts for aircraft, ensuring that these parts meet safety and design standards set by the FAA.

Understanding PMA is essential for professionals in the aviation industry, as it directly affects the maintenance, repair, and airworthiness of aircraft. This section emphasizes the importance of adhering to strict regulatory processes to ensure that any replacement parts are safe and reliable.

The other sections mentioned pertain to different aspects of aviation regulations. For instance, sections related to aircraft performance specifications or identification of aircraft and components do not cover the specific topic of PMA, making §21.303 the correct reference for those seeking to understand the legal framework surrounding replacement and modification parts in aviation.